Saw-filing attachment.



G. KELLY. SAW FILING ATTACHMENT. APPLICATION FILED we. 16, 1909.

Patented Sept. 5, 1911.

2 SHEETS-SHEET 1.

G. KELLY. SAW FILING ATTACHMENT. APPLIOATION FILED AUG. 16, 1909.

1,002,280. Patentedfiept. 5, 1911.

2 BHEETBSHEET 2.

HHHI

COLUMBIA PLANOGRAPM 1:0 WASHINGTON. n. c.

GEORGE KELLY, OF I-IINSDALE, ILLINOIS.

SAW-FILING ATTACHMENT.

To all whom it may concern:

Be it known that I, GEORGE KELLY, a citizen of the United States,residing at Hinsdale, in the county of Dupage and State of Illinois,have invented a new and useful Saw-Filin Attachment, of which thefollowing is a specification.

The invention relates to a saw filing attachment.

The object of the present invention is to provide a simple, durable andpractical saw filing attachment of inexpensive construction, designedfor various kinds of saws either straight or circular, and adapted to beconveniently carried in the tool kit of a carpenter or other mechanic,and capable of being readily applied to a saw and of affording a guidefor the file and a protector and guide for the saw to enable a saw to berapidly and accurately sharpened without liability of spoiling the sameby filing the Wrong teeth.

A further object of the invention is to provide a saw filing attachment,which, when applied to a saw blade, will expose each alternate recessand cover the intervening recesses, and thereby permit the file to enteronly the proper recess and which when shifted along the saw blade thedistance of one tooth will expose the previously guarded recesses andcover the recesses in which the file has been used, whereby only theproper cutting edge of every other tooth will be filed.

lVith these and other objects in view, the invention consists in theconstruction and novel combination of parts hereinafter fully described,illustrated in the accompanying drawings, and pointed out in the claimshereto appended; it being understood that various changes in the form,proportion, size and minor details of construction, within the scope ofthe claims, may be resorted to without departing from the spirit orsacrificing any of the advantages of the invention.

In the drawings: Figure 1 is a longitudinal sectional, View of a sawfiling attachment, constructed in accordance with this invention, andshown applied to a saw, the latter being shown in elevation. Fig. 2 is aperspective View of a portion of the saw filing attachment. Fig. 3 is atransverse sectional view, the parts being arranged as shown in Fig. 1.Fig. 4 is a similar view,

illustrating another form of the invention Specification of LettersPatent.

Application filed August 16, 1909.

Patented Sept. 5, 1911. Serial No. 513,138.

in which the sides of the device are made in separate pieces. Fig. 5 isa side elevation of another form of the invention, showing the sawfiling attachment applied to a circular saw. Fig. 6 is a longitudinalsectional-view of the same. Fig. 7 is a transverse sectional view.

Like numerals of reference designate corresponding parts in all thefigures of the drawings.

In the embodiment of the invention illustrated in Figs. 1 toS inclusiveof the drawings, the saw filing attachment 1 is composed of two similarsides 2, spaced apart to receive a saw blade 3 between them and connected at the top by integral tapered guards 4, composed ofapproximately triangular side portions and a top connecting portion 5.The tapered guards, which cover and protect the cutting edge of eachalternate sawtooth, extend over the alternate intervening recessesbetween the saw teeth and guard the same and prevent the file fromentering the wrong recess, whereby the filing of the proper saw tooth isassured. The intervening V-shaped recesses 6 between the guards 4 aredownwardly tapered and correspond with the shape of the recesses betweenthe saw teeth, the front and rear edges of the tapered guards beinginclined similarly to the front and rear edges of the saw teeth.

The tapered recesses 6 of the saw filing attachment are of slightlygreater size than the intervening recesses between the saw teeth, inorder to expose completely the saw at the said recesses to enable theexposed cutting edges of the teeth to be filed with the same facility aswhen a saw filing attachment is not employed. This result is secured bymaking the guards 4: at their ,outer portions less in width lengthwiseof the saw than the width of the outer portions of the tapered recesses6, which recesses separate the guards from each other, so that theguards, while closing the space between each alternate pair of teeth,and thus preventing the file from entering therein, yet leave enough ofthe teeth exposed to effect the filing operation. The front cutting edgeof one tooth and the back edge of the next adjacent tooth are exposed ateach recess of the saw filing attachment, so that one side of two teethmay be sharpened at the same time.

The saw filing attachment is placed over a saw blade with its upper endor end adjacent to the handle of the saw arranged at one tooth orcutting edge, and the saw and the attachment are clamped in a vise 7 orother suitable holding means. The exposed cutting edges of the teeth arefiled, and when the exposed set of teeth are sharpened, the saw isreversed in the vise and the saw filing attachment is movedlongitudinally of the saw blade the distance of one tooth to carry itsinner or upper end to the next tooth from the position previouslyoccupied by it. This exposes the other set of saw teeth and the cuttingedges thereof may be filed. The reversal of the saw enables the file tobe used in the customary manner with the operator standing at the frontof the vise. The angle and the depth of the teeth of saws vary greatly,and under some cir cumstances I make the attachments in rights andlefts, by providing the recesses 6 with either a right hand bevel or aleft hand bevel. In this way it would take two separate attachments tocomplete the filing of the saw. After one attachment had been used itwould be removed and the other put in place. It is not always necessaryto clamp the attachment to the saw by the vise which supports the saw.Frequently, it is only sutficient to drop the attachment over the teethof the saw and it will hold itself in position by its own weight.

The saw filing attachment may be made of a length to extend along theentire blade of a saw, or it may be constructed of a length less thanthe saw blade, and may be shifted along the same to enable the differentportions of a saw to be successively sharpened. Also the saw filingattachment, as illustrated in the embodiment of the invention shown inFig. 41, may be constructed of two separate plates or members 8 providedat their upper edges with corresponding tapered guards 9 and interveningtapered recesses. The separate plates or members 8 may be firmly clampedagainst the opposite faces of a saw blade by the jaws of the vise, asshown, and the pro jecting tapered guards will cover and protect one setof the cutting edges of a saw and expose the other set.

The guards and intervening recesses of transverse portions 13. Thetapered guards 12, like those heretofore described, cover the cuttingedges of one set of teeth and expose the cutting edges of the alternateteeth, the intervening recesses 14 between the tapered guards beingslightly greater in size than the recesses between the saw teeth 15 tocompletely expose the edges at the recess in which the file is placed.

The saw filing attachment for circular saws guards and protects thecutting edge in the same manner as the saw filing attachment for sawshaving straight edges, and they may be variously constructed so as toenable half of the sawto be operated on or a less portion thereof. Ineach form of the saw filing attachment employing the outer transverseconnecting portions 5 of the guards, the device acts in a dual capacity,as it not only guards and protects every other tooth, but it alsoprotects the operator and prevents the hands from coming in contact withthe cutting edge of the saw.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent, is

1. A saw filing attachment comprising flat plate or member adapted tofit along a side of a saw blade and form both a guard and guide for theteeth and file respectively within the limits of the length of theattachment, and provided at its outer edge with a plurality ofalternating spaced guards and recesses, the guards being narrower inwidth at their outer portions lengthwise of the saw than the width ofthe outer portions of the recesses so as to close every alternate spaceseparating the teeth of the saw blade and leave the spaces between theother teeth exposed.

2. A saw filing attachment comprising a fiat plate or member composed oftwo sides spaced apart to receive a saw blade between them and form botha guard and guide for the teeth and file, respectively, within thelimits of the length of the attachment, and provided at its outer edgewith aplurality of alternating spaced guards and recesses, which arereversely tapered, the walls of the recesses defined by the front andrear edges of the guards being inclined to accord with the inclinationof the saw teeth, said guards decreasing in width lengthwise of the sawfrom their inner to their outer portions while the recesses increase inwidth from their inner to their outer portions, the width of the outerportions of the guards being less than the width of the outer portion ofthe recesses, whereby each alternate space separating the teeth of thesaw blade is closed by the guards leaving the spaces between the otherteeth exposed.

3. A saw filing attachment comprising a plate, or member composed of twosides spaced apart to receive a saw blade between them and embrace thesaw teeth within the limits of the length of the attachment, said sidesbeing adapted to bear againstthe sides of the saw blade when the latterand the at tachment are placed in a vise so as to hold the two inassociated relation during the filing operation, said plate or memberbeing provided along its outer edge with a plurality of alternatingspaced guards and recesses formed in each side, the guards and recessesof one side being in alinement with the guards and recesses of the otherside, the recesses being V-shaped and the guards being composed oftriangular side portions and an outer transverse connecting portion,said guards having their outer portions lengthwise of the saw narrowerthan the outer portions of the recesses so as to close each alternatespace separating the teeth of the saw blade and leave the spaces betweenthe other teeth exposed, the front cutting edge of one tooth and therear cutting edge of the next adjacent tooth being exposed at eachrecess, whereby one side of two teeth may be sharpened at the same time.

In testimony, that I claim the foregoing as my own, I have heretoaffixed my signature in the presence of two witnesses.

GEORGE KELLY.

EDYTHE HALL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

